Liquid-fuel burner



` April 2s, 1925.

G. W. WALSH ET AL LIQUID FUEL BURNER Filed Feb. 15, 1924 PatemedApr. 2s, 1925..v

AGEORGE F BOSTON, BLAIN'ESWEATT, 0F EVEREIT, MASlACHUv SETTS; ASSIGNORS, BY MSNE ASSIGNMENTS, T0 SAID WALSH.

LIQUID-FUEL nomma. y

Application mea rebruaryis, 1924. l* serial" 1&0. eaaioo,

To dll whom 'it may concern:r I, v Be it knownthat we,GEonGniW. WALSH and BLAIign SWEATT, citizens of the United States, and residents of Boston, in the i county of Sulfolk and 'State of Massachusetts, and Everett, in .the county .of Middlesex and State of' Massachusetts, res ectively, have invented a new and useful mprovement in Liquid-Fuel Burners, of which the following is specification. j A

Our Vinvention relatesto liquid-fuel burners and more especially to such burners for use inpowerplant boilers, oil stills andthe like, although it is capable of use in other relations.

'llhe principal objects'of our invention are to provide liquid-fuel burners in which low lpressure or exhaust steam may be used `for atomizin the oil or liquid-fuel, in which aj mixing c amber is providedfor receiving the. atomized liquid-fuel and further atomizingrthe same, and in which the atomiz'er is readily removable .from the interior of cconduit is provided with an outletherein l its casing for the. purpose of cleansing the same.

vWith the foregoing, objects in view curinvention, comprises a source of liquid fuel, f ya source of lowpressure steam, such for example, as the ste-amV from .the power -fp'lantH nected to the low-pressure steam source and sion chamber, ltogether witlinan atomizer so located in the yexpansion chamber that the ,'35 latter" is provided with an annular outlet pri-axial' with the fuel conduit and having,

tthe nel conduit being provided with anout- 4.0 let communicating .with a. narrow discv sisaped chamber of adjustable width having- 1 annular outletj'and'its'laxis coincident' with the axis of said outlet, by virtue -of which construction the steam iowingffrom the expansion chamber acquires a high velocity through said vessel.

exhaust, a steam-expansion chamber `'con- \v p curing the ycon'e`8in adjusted position..` afuel conduit-passing through said expan-f plane at right angles tojthe laxis of the-1 Other features of novelty will be herein- 55 afterl particularly described an'd setforth in the Vappended claims.V

In "the drawino' which accompanies ang forms-a part of this specification the gur 1s a 'central longitudinal section of a .liquid- 60 fuel burner embodying Jour invention. In "the particular drawing selected for4 more fully illustrating the principle of our invention and which is to be considered merely as illustrative and not restrictive, 1 65 represents a pipe leading to a source of liquidsfuel and connectedfby means of the .wing-nut Q to'a' vessel 3 herei'n shown Ias,

globular and to an'oil conduit 4 passing i The pipe 5 leads to a source of low pressure steam, such as thevexhaust from an en'.

gine or turbine, and is threaded' to vessel 3 which, having a cross sectional area very much larger than that of Jsaid pipe, con-A -stitutes an` expansion chamber. The fuel-I va narrow disc-shaped chamber 7 formed be'- 80 i tween the cone threaded to the lfuel conduit and the cone 9 integral with the same at its outer 'enil. 'T l 'A'oclr-nut 1Q may be `provided for se- The vaporizer onrthe end of the .fuel con` duit extends'through the outlet of the expanson chamber, said^outlet,bei1g the an*- n'ularpassage 11` coaxial with the fuel conduit, and having a cross-sectional area very y a crosssectional area which 1s'. `ver small small compared to that of the expansion com ared .to that of the Sexpansronv c lambert@ f chamber. V .f l Formed vkintegral with the` expansion chamber isagvessel -12 constitutinglamixing chamber, the inner surface of which is to further breakup a d further atomize the as it asses the peripheryofgthe thin disc of, fuel before it asses nthrough the pipe 14 n liqui -fuel formed inf.r said ldisc-shaped chamberandf atomizes the same. if' 50` Ourv invention comprisesl also -a mixing f chamber arranged forreeeiving the atom i'zlel; liquid-fuel Aand provided! with corru 1, gatipns onf its inner surface for furtherv y atmizingthe liquid fuel,

boiler furnace. f. j

. In, practice we havefoundthat'the radial f Width of .the annular passage ma' be one` .105 eighth of an inch, and that the wi th of the disc-shaped chamber 7- may vary from one thirtysecond of4 an inch to one sixteenth of leading to the urner tip 15 located nkthe. 4

' an inch, depending on the gravity of the oil or other liquid fuel employed. `The operation is as follows: Y i The low-pressure steam which m'ay be eahaust steam oftfrom five pounds to teil pounds pressure', enters the chamber 3 and expands; and then by virtue of the eone'S graduall increases in velocity until it passes t rough the annular outlet 11 in which it acquires a very high velocity so that as it passes the periphery of the thin disc.

f of liquid-fuelformed inthe chamber 7 it this result in the burners of the prior art.

Experience has demonstrated the desira- V'bilityof providing means for detachably securing the vatomizer. to the expansion chamber for the reason that Ythe outlet 6 -and chamber 7 sometimes becomeclogged, especially when heavy Agravity oil, 'is employed.

they atomizer from its associated parts for the purpose of cleaning its passages.

Having thus described an illustrative cm- .bodiinent of our' invention withoutlhowever 4limltlng ourselves lthereto, what we claim and desire to secure by Letters Patenti'm-F' 1. Thecombination with a source of liquid fuel and a source of low-pressure steam of a liquid-fuelburner comprising a vessel constituting a steam-expansion chambn'a pipe connecting .saidvessel to saidy source of low-pressure steam, said vessel having a cross-sectional area very large compared to that offsaid pipe, a fuel conduit passing through said expansion chamber and conv neeted to said source of liquid fuel, said expansion chamber being provided with au annular outlet, c'o-axial with saiducoifduit .disc of liquid fuel The wing-nut 2,' as will be obvious, affords` a convenient means for quickly detach'ingfv and said annular outlet having a crosssectional area very small compared to that of said expansion chamber, a member on a the outer end ofsaid conduit and a member on said conduit intermediate theends thereof and separated from the rst mentioned member to form therewith a: narrow disc-shaped chamber co-axial with saidannular outlet and having itsplane at :'1 ight angles -to the axis thereof, said fuel conduit being provided with an outlet icommunicating with said narrow disc-shaped chamber, whereby the" steam flowing ,from

said ,expansion chamber r uires a hlgh vel locity as it passes the erip ery'of the1 thin flirmed in saidxfdisc-l shaped Chamberland atomizes the same.

2. The cmbination with la. source of liq- -uid fuel and a source of low-'pressure steam of a liquid-fuel burner comprising a 'vessel constituting a steamfexpanslon chamber connected to said lsource f low-pressure steam, a fuel conduit passing throu h said source of liquidfuel, said expansion chamber being provided with an annular outlet co-axial with said conduit and said annular outlet yhaving a cross-sectional a.rea' verv small compared to that .ofsaid expansion chamber, a memberson the outer end of said conduit, anda member adjustable longituexpansion 'chamberl and, connected o. said Ase dinally along said conduit intermediate the g ends thereof and separated from the first mentioned .member to form therewith a narfroyv disc-shaped chamber of variable width coaxial with Asaid annular outlet and having its plane at right angles to the axisthereof, y said fuelc'onduit being' provided with are outletacommunicating with said narrow discshaped chamber,whereb v the steam flowing from said expansion chamber a uires a high velocity vas it passesthe peri ery vof thelthindisc ofliquidfuel forme in said disc-shaped vchamber and atomizes the same.

In testimony whereof, we havehereunto subscribed our names this 8th day of Februa'ry, 1924.' y Y v GEORGE WALSH.

`IBLAINE 'SWEAT'L 

